Tree sawing device



April 11, 1933.

E. C. RUMOHR TREE SAWING DEVICE Filed Oct. 21, 1931 2 Sheets-Sheet lamv/Mio@ 6. Aya/vanos NNY April 11, 1933- E. c. RUMOHR 1,903,479

' TREE SAWING DEVICE.

Filed Oct. 21, 1951 2 Sheets-Sheetl 2 m agwg.

Patented Apr. 11, 1933 Umrrau STATES ERNEST C. RUM'OHR, OF' SEATTLE,WASHINGTON TREE SAWING :DEVICE Application med october 21, k1931. serialNa. 570,203.

This invention relates to improvements in a tree Vcutting apparatus, andhas for its ob.- ject to provide an apparatus of this character, bymeans of which, a power operated saw may be conveniently applied, and astanding tree quickly cut in two.

Other features and objects will appear as the invention is more fullyhereinafter described and explained in the following specifi cation,shown in the accompanying drawings, and finally pointed out in theappended claims.

In the drawings: Y. Fig. 1 is a plan view of the apparatus. Fig. 2 is aside elevation of same. Fig. 3 is a detail sectional View taken on theline 3-3 of Fig. 1. Fig. 4 is a cross sectional view of the eccentric.

Fig. 5 is a detail sectional view taken on the line 5-5 of Fig. 1.

Fig. 6 is a detail view, showing mechanism for feeding the saw.

Fig. 7 is a side elevation showing a tree partly sawed, and a screwmeans for holding the sawed parts spaced away from each other.

Referring now more particularly to the drawings, reference numeral 1indicates a base, secured to which is a bearing 2, through which passesa shaft 3, upon one end of which is a gear 4. The opposite end of theshaft passes through a bearing 5, extending upwardly from an arm 5a,which is bent upwardly from the base and has a flange 5B. Extendingupwardly from the base 1 are bearing blocks 6` and 7 secured in place bymeans of bolts 8. 9 is a motor secured to the base by means of bolts 10.To the shaft of the motor is secured a gear 11, which meshes with thegear 4. 12 is an eccentric member mounted on the shaft 3. 13 is anextension from a strap associated with the eccentric and which will bepresently described. Pivoted to the extension 13 is one end of a pitmanrod 14. The opposite end -of the pitman rod 14 slidably passes through abearing 15, and its right hand end, Fig. 1, is secured at 15-a to oneend of a saw 15-72. A strap 16 is fitted on the periphery of theeccentric 12, the strap being concave on its 22 to a boss '22-aextending from the bearing 'inner surface to snugly engage the convexperiphery of the eccentric. Obviously when the shaft 3 is rotated, theeccentric 12 willV irnp part reciprocatory motion tothe pitrnan rod i14, and the saw 15-b. The eccentric 12 is n keyed to the shaft 3 at 17,so that the eccentric rotates withthe shaft 3 and `also is permitted to'slide back and forth on the shaft. 18 "is 'a boss ri-gidwith theeccentric 12 and through which the shaft 3 freely passes. The boss isVenlarged as at 19 and is provided on its periphery withV an annulargroove 20. 21V is an arm, one of whose ends .is secured by bolts 15. Theopposite end terminates in yoke members 23, (Fig. 3), which extend .intothe annular groove 20 ofthe boss 1'8. Through the bearing 15 passes Yascrew threaded shaft 24 mounted in bearings in the blocks 6 and 7. l

A425 is a shaft passing through blocks 6 'and y7 and the bearing 15 sothat the vbearing 15 ris permitted to slide upon the shaft "25. 26 isashaft identical with the shaft 25 'and slidably passes through thebearing 15 and has bearings in the blocks 6 and 7. 27 is ajpro-"-jection from the bearing block 6 which is bored -through to Vreceiveone end of `a shaft 28, the opposite end of said shaft fitting 'in asimilar bearing .29 'extending from a block 30, identical with th'eblock6. i

The' description just made of the left hand end of the apparatusdescribes the right lhand end, (Fig. 2), with the exception that :the

`description of the "le-ft 'hand endfnclu'ded the motor, eccentric, etcetera. Toeach lend of the shaft L28 is agear 31. The gear atthe left`hand end of the shaft 28 meshes with a similar ,gear 32 upon the shaft24. The gear 31 at the-right hand 'end -of vshaft 28 meshes with asimilar gear`33'upon the shaft 34 .identical with shaft 24. `Upon yoneend, of the shaft '34 is a crank vv35, so that by turningthe crank, bothshafts v24 and 34 are 'caused to rotate, vthus feeding the saw 115-6aj,f fa"in`st,

is a tree, indicated at 736. 37 lis a l"link, one

thework, which as .shown in the drawingsf end of which is lpivotallyconnected to an arm f 38 mounted on the shaft and provided with a pawl39, which coacts with a toothedv wheel 40 rigidly secured tothe screwshaft 24.

The opposite end of the link 37 is pivotallyconnected at 41 to a disc 42secured to the shaft 3. By this arrangement, When the shaft 3 isrotated, the link 37 is reciprocated, causing the arm 38 to oscillate,which, through the pavvl 39, imparts a rotative movement to the screwshaft 24. The result of this is that thebearing 15 is advanced, carryingthe savv 15--5 With it against the Work, and through the gears 31,'shaft28, and gears 33, the bearing 44 isset or advanced forward in the samemanner. The eccentric 12 and arm 21 also, of course, move With.- thebearings 15 and 44. v

45 1indicates jaw blocks vwhich are slidably mounted upon rodsv 46 whichpass through bearings 47. The left `hand pair of the bearin, 2;s-47,(Fig. 1,), are securedy to the base 1 by bolts 48. The right hand pairof bearings 4'farevsecured to a plate 49 bymeans of bolts 5 0. Y 51,indicates bolts which pass through bosses 52 extending from the bearingblocks 45, and are provided with nuts 53, so that by turning thenuts,the jaw blocks 45 are drawn Atowards Yeachother in a transversedirection a saw reciprocally carried by said threadedly mounted blocks,a motor for reciprocating said saW, and a ratchet mechanism connectedWith the motor for turning the threaded shafts and -advancing the saWduring the sawing operation.` y

' 2. 'A tree'sawing device as claimed in claim 1, with manually operatedmeans for initially moving the saw to tree-engaging position.

In testimony WhereofI aiiix my signature.

c ERNEST o. RUMQHR.

so that; the boss of the jaw blocks Will sink into the treeto be savved.

In operation, one ofthe rods 46 is puiled ,through its bearing, and theapparatus is moved up to a tree, with thesaw 15-5 in contact withoneside of thetree. The rod 4 6, which was removed, is novvieplaced so-thatf'the apparatusV embraces the tree, las

shown in Fig. 1. rIhe nuts 53 arel now ad- ]u'sted to cause the gaws45to sinkinto the surface of the tree and lfirmly grip the same,

yand thereby hold the apparatusin operative position. The motor thenstarted, Which.

cip'ro'cate and saw into the tree, Asth-e sawing.operationj progresses,the saw 1s fed `through lthe shaft 3, eccentric 12, strap 16, pitman rod14, causes the saw 15-5 to reinto thev tree through thefeeding'mechanism already described, including the lblock 38,

par'fvl 39, disc 42, and link 37.

When the apparatus is placed in yitsposition, as shown in Fig. 1, readyto begin the sawing, the crank 35 may be turned so as'to `advance thesaW up to the Work. 350

Whenthe tree is saWed sufficiently through to tend to clamp the saw, athreaded Wedge 36e-a may' be introduced behind the saw so .as to Wedgeup the left hand :side of the partially sav/ed tree, as shown in Fig. 7

While I have shown and described a particular form of embodiment of myinveny tion, Iam aware that many minor changes Will readily suggestvthemselves to f those .skilled in the art Without departing from thespirit and scope of my invention. Itherefore desire to avoid beinglimited tothe partic- A`1.V"A tre`e sawingapparatus comprising a

